I understand that 0-g rolls follow a parabola, but that doesn't mean that every parabola is the same size and entered at the same speed. All of us have probably taken algebra and most of us calculus, so we should know how easily it is to stretch and skew a parabola mathematically. Yes, even though back in 1992 B&M was using a parabola, it seems like they were designing 0-g rolls to be higher and sharper. Recently, 0-g rolls seem to be shorter and more drawn out with a longer roll. For a visual representation...
...This:
or better yet, this:
is similar, but not the same as this:
or this:
You have an engineering degree and that's perfectly fine. I've learned quite a lot from you over the years. That doesn't mean that the rest of us are clueless though. Some of us are working on our own engineering degrees ourselves. I may not have taken fluid dynamics, heat transfer, or higher level engineering classes yet, but I don't need to have taken those classes to know what a parabola is and how it's used in 0-g roll design.